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数值模拟鉴江高岭拦河闸流量数学模型建立与水力特性
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作者 杨楚斌 《云南水力发电》 2024年第11期14-17,共4页
基于数值模拟方法,建立了鉴江高岭拦河闸流量的数学模型,并对其水力特性进行了研究。首先,使用FLUENT软件对鉴江高岭拦河闸进行了三维几何建模,并设置了边界条件和物理参数。然后,采用计算流体力学(CFD)方法,对拦河闸流量进行了数值模... 基于数值模拟方法,建立了鉴江高岭拦河闸流量的数学模型,并对其水力特性进行了研究。首先,使用FLUENT软件对鉴江高岭拦河闸进行了三维几何建模,并设置了边界条件和物理参数。然后,采用计算流体力学(CFD)方法,对拦河闸流量进行了数值模拟。通过模拟计算得到了泄流能力、水面高程、压强、流速等水力特性参数。研究结果表明,基于数值模拟的鉴江高岭拦河闸流量数字模型建立及水力特性研究,可以为鉴江高岭拦河闸的设计和优化提供参考,同时为拦河闸的运行和管理提供科学依据。 展开更多
关键词 数值模拟 鉴江高岭拦河闸 流量数学模型 水力特性
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铜精炼反射炉熔化期重油流量数学模型与应用
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作者 鄂加强 刘春洋 时章明 《矿冶》 CAS 2004年第2期61-64,共4页
依据能量平衡原理,建立了基于铜精炼反射炉熔化期重油流量的数学模型,并根据不同富氧率和不同预热温度下的铜精炼反射炉熔化期重油流量数学模型进行计算。计算结果表明,助燃空气预热时更能节约重油。采用此方案后,铜精炼反射炉的节能效... 依据能量平衡原理,建立了基于铜精炼反射炉熔化期重油流量的数学模型,并根据不同富氧率和不同预热温度下的铜精炼反射炉熔化期重油流量数学模型进行计算。计算结果表明,助燃空气预热时更能节约重油。采用此方案后,铜精炼反射炉的节能效果十分显著。 展开更多
关键词 反射炉 铜精炼 富氧 预热助燃空气 重油流量数学模型
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ILAN中基于流量模型的网络控制方法研究 被引量:1
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作者 黄松清 余坚毅 《控制工程》 CSCD 北大核心 2012年第S1期136-138,141,共4页
如何对网络流量实施有效管理和控制是网络性能评价、网络协议设计和网络规划等考虑的关键因素之一。在对普通ILAN(工业局域网)底端现场总线分析的基础上,提出了一种流量计算的数学模型,据此模型,提出了一个基于PID方法的流量控制机制。... 如何对网络流量实施有效管理和控制是网络性能评价、网络协议设计和网络规划等考虑的关键因素之一。在对普通ILAN(工业局域网)底端现场总线分析的基础上,提出了一种流量计算的数学模型,据此模型,提出了一个基于PID方法的流量控制机制。实验仿真证明该PID机制具有良好的瞬态和稳态性能,鲁棒性好,网络资源利用率高。最后在工业局域网实际分析的基础上提出了一种改进型的流量控制机制。 展开更多
关键词 工业局域网 流量数学模型 PID 流量控制
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气体传感器试验分析系统 被引量:4
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作者 马戎 周王民 +1 位作者 陈明 孙汝忠 《传感器技术》 CSCD 北大核心 2004年第3期48-50,共3页
在分析研究了电子鼻的基本原理和系统组成的基础上,建立了气体传感器(7ST/F,7NDH)流量静态数学模型和试验分析测试系统,对其输入-输出特性进行了试验测试,并用Matlab对试验数据进行了分析与研究。通过试验,验证了模型的正确性及分析测... 在分析研究了电子鼻的基本原理和系统组成的基础上,建立了气体传感器(7ST/F,7NDH)流量静态数学模型和试验分析测试系统,对其输入-输出特性进行了试验测试,并用Matlab对试验数据进行了分析与研究。通过试验,验证了模型的正确性及分析测试系统的通用性,获得了具有应用价值的结果,为后续的模式识别技术和人工神经网络技术的应用打下了基础。 展开更多
关键词 气体传感器 模式识别 流量静态数学模型 试验分析测试系统 MATLAB
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Temperature Distribution in Ethylene Pyrolyzer 被引量:3
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作者 蓝兴英 高金森 徐春明 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2003年第6期622-625,共4页
A good understanding of the detailed temperature distribution in the furnace plays an important role in the implementation of operation optimization and design improvement of ethylene pyrolyzer. Numerical simulation o... A good understanding of the detailed temperature distribution in the furnace plays an important role in the implementation of operation optimization and design improvement of ethylene pyrolyzer. Numerical simulation of the turbulent flow, combustion and heat transfer was carried out to investigate the temperature distribution in industrial furnace. Inhomogeneities of the flue-gas temperature distribution were observed in X, Y, and Z direction of the furnace from the simulated results. Along the height of the furnace, the average flue-gas temperature increased initially and decreased afterward, and reached its peak at the height of 5 m. The reactor tube skin temperature varied not only along the height of the furnace, but also around the circumference of the tube. The heat flux profiles from the furnace towards the reactor tubes followed the shape of the average flue-gas temperature profile. The heat flux of the inlet tubes was constantly higher than that of the outlet tubes at the same height in the furnace. 展开更多
关键词 ETHYLENE pyrolyzer FURNACE reactor tube FLUE-GAS TEMPERATURE heat flux
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Research on traffic flow forecasting model based on cusp catastrophe theory 被引量:2
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作者 张亚平 裴玉龙 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2004年第1期1-5,共5页
This paper intends to describe the relationship between traffic parameters by using cusp catastrophe theory and to deduce highway capacity and corresponding speed forecasting value through suitable transformation of c... This paper intends to describe the relationship between traffic parameters by using cusp catastrophe theory and to deduce highway capacity and corresponding speed forecasting value through suitable transformation of catastrophe model. The five properties of a catastrophe system are outlined briefly, and then the data collected on freeways of Zhujiang River Delta, Guangdong province, China are examined to ascertain whether they exhibit qualitative properties and attributes of the catastrophe model. The forecasting value of speed and capacity for freeway segments are given based on the catastrophe model. Furthermore, speed-flow curve on freeway is drawn by plotting out congested and uncongested traffic flow and the capacity value for the same freeway segment is also obtained from speed-flow curve to test the feasibility of the application of cusp catastrophe theory in traffic flow analysis. The calculating results of catastrophe model coincide with those of traditional traffic flow models regressed from field observed data, which indicates that the deficiency of traditional analysis of relationship between speed, flow and occupancy in two-dimension can be compensated by analysis of the relationship among speed, flow and occupancy based on catastrophe model in three-dimension. Finally, the prospects and problems of its application in traffic flow research in China are discussed. 展开更多
关键词 capacity cusp catastrophe model speed-flow curve traffic flow forecasting
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Mathematical model for coupled reactive flow and solute transport during heap bioleaching of copper sulfide 被引量:5
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作者 尹升华 吴爱祥 +1 位作者 李希雯 王贻明 《Journal of Central South University》 SCIE EI CAS 2011年第5期1434-1440,共7页
Based on the momentum and mass conservation equations, a comprehensive model of heap bioleaching process is developed to investigate the interaction between chemical reactions, solution flow, gas flow, and solute tran... Based on the momentum and mass conservation equations, a comprehensive model of heap bioleaching process is developed to investigate the interaction between chemical reactions, solution flow, gas flow, and solute transport within the leaching system. The governing equations are solved numerically using the COMSOL Multiphysics software for the coupled reactive flow and solute transport at micro-scale, meso-scale and macro-scale levels. At or near the surface of ore particle, the acid concentration is relatively higher than that in the central area, while the concentration gradient decreases after 72 d of leaching. The flow simulation between ore particles by combining X-ray CT technology shows that the highest velocity in narrow pore reaches 0.375 m/s. The air velocity within the dump shows that the velocity near the top and side surface is relatively high, which leads to the high oxygen concentration in that area. The coupled heat transfer and liquid flow process shows that the solution can act as an effective remover from the heap, dropping the highest temperature from 60 to 38 ℃. The reagent transfer coupled with solution flow is also analyzed. The results obtained allow us to obtain a better understanding of the fundamental physical phenomenon of the bioleaching process. 展开更多
关键词 copper sulphide heap bioleaching leaching reaction solution flow solute transport
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A Transient Multidimensional CFD Approach to the Analysis of a Control Valve Using Non-Newtonian Fluids
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作者 Fabrizio Grasselli Massimo Milani Luca Montorsi Fabrizio Paltrinieri 《Journal of Energy and Power Engineering》 2012年第9期1398-1407,共10页
In this paper the flow through a control directional valve is studied by means of a CFD (computational fluid-dynamics) analysis under transient operating conditions. The mesh motion is resolved on a time basis as a ... In this paper the flow through a control directional valve is studied by means of a CFD (computational fluid-dynamics) analysis under transient operating conditions. The mesh motion is resolved on a time basis as a function of the external actuation system In the analysis, an open source fluid-dynamics code is used and both cavitation and turbulence are accounted for in the modeling. Moreover, the numerical model of the working fluid is modified in order to account also for the non-Newtonian fluids. The effects of the shear rate on the shear stress are accounted for both by using experimental measurements and correlations available in literature, such as the Herschel-Bulkley model. The analysis determines the performance of the control directional valve under different operating conditions when using either Newtonian or non-Newtonian fluids. In particular, the discharge coefficient, the recirculating regions, the flow acceleration angle and the pressure and velocity fields are investigated. 展开更多
关键词 CFD hydraulic valve transient analysis moving mesh non-Newtonian fluid.
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FLOW OF MICROPOLAR FLUID THROUGH CATHETERIZED ARTERY -- A MATHEMATICAL MODEL 被引量:1
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作者 D.SRINIVASACHARYA D.SRIKANTH 《International Journal of Biomathematics》 2012年第2期61-72,共12页
In this paper, the flow of blood through catheterized artery with mild constriction at the outer wall is considered. The closed form solutions are obtained for velocity and microrotation components. The impedance (re... In this paper, the flow of blood through catheterized artery with mild constriction at the outer wall is considered. The closed form solutions are obtained for velocity and microrotation components. The impedance (resistance to the flow) and wall shear stress are calculated. The effects of catheterization, coupling number, micropolar parameter, and height of the stenosis on impedance and wall shear stresses are discussed. 展开更多
关键词 STENOSIS CATHETER micropolar fluid IMPEDANCE wall shear stress.
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An investigation of non-Newtonian fluid flow due to metachronal beating of cilia in a tube 被引量:2
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作者 A. M. Siddiqui A. A. Farooq M. A. Rana 《International Journal of Biomathematics》 2015年第2期29-51,共23页
The aim of this study is to explain theoretically the role of ciliary motion on the transport of epididymal fluid through the ductus efferentes of the male reproductive track. For this purpose, a mathematical model ha... The aim of this study is to explain theoretically the role of ciliary motion on the transport of epididymal fluid through the ductus efferentes of the male reproductive track. For this purpose, a mathematical model has been developed for the flow of a non-Newtonian fluid in an axisymmetric tube due to metachronal wave of cilia motion for the more realistic consequences. Carreau viscous fluid model is considered to see the rheological effects on the pumping characteristics of the flow. Regular perturbation method has been employed to obtain the analytical expressions for the stream function, the velocity field and a relation between the pressure difference and the volume flow rate. It is found that the volume flow rate is influenced significantly by Weissenberg number We and the cilia length parameter ε. The computational results are presented graphically to see the effects of various physical parameters. Finally, the analysis is applied and compared with the observed value of the flow rate of spermatic fluid in the ductus efferentes of the male reproductive track. The volume flow rate is reported closed to the estimated value 6 × 10^-3 ml/h in the human ductus efferentes when We = 0.5 and e is near by 0.25. 展开更多
关键词 Cilia-induced motion axisymmetric tube metachronal wave Carreau fluid analytic solutions pumping and trapping.
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Biomathematical study of Sutterby fluid model for blood flow in stenosed arteries
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作者 Noreen Sher Akbar DBSCH, CEME 《International Journal of Biomathematics》 2015年第6期87-98,共12页
In this paper, we have discussed the biomathematical analysis of Sutterby fluid model for blood flow in stenosed tapered arteries. The equations for the Sutterby fluid model are modeled in cylindrical geometry. The eq... In this paper, we have discussed the biomathematical analysis of Sutterby fluid model for blood flow in stenosed tapered arteries. The equations for the Sutterby fluid model are modeled in cylindrical geometry. The equations have been developed for the ease of mild stenosis. Perturbation solutions are attained in terms of small Sutterby fluid parameter β for the velocity, impedance resistance and wall shear stress. Three types of arteries i.e. converging, diverging and non-tapered have been considered for the analysis and discussion. Graphical results have been presented for different parameters of interest. Streamlines have been plotted at the end of the paper. 展开更多
关键词 Blood flow Sutterby fluid tapered stenosed arteries perturbation solution
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